Assumption
Assumption noun - Something taken as being true or factual and used as a starting point for a course of action or reasoning.
Usage example: your argument is faulty because it's based on erroneous assumptions
Basis is a synonym for assumption in reason topic. In some cases you can use "Basis" instead a noun "Assumption".
Basis
Basis noun - An immaterial thing upon which something else rests.
Usage example: the sole basis for the rumor is someone's overactive imagination
Assumption is a synonym for basis in action topic. Sometimes you can use "Assumption" instead a noun "Basis", if it concerns topics such as reason.
Nearby Word: basic
Mutual synonyms
Related pairs
- principle and assumption
- principle and basis
- argument and assumption
- argument and basis
- ground and assumption
- ground and basis
- thesis and assumption
- thesis and basis
- theory and assumption
- theory and basis
- postulate and assumption
- postulate and basis
- presupposition and assumption
- presupposition and basis
How words are described
Both words in one sentence
- This becomes the basis of the free people's entire strategy after Pippin looks into the palantír, premised entirely on the assumption that Sauron would assume that his enemies would try to use the ring against him rather than try to destroy it.
Source: Batman Gambit / Literature
Cite this Source
Basis and Assumption. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/assumption/basis
Assumption & Basis. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/assumption/basis>.
Basis or Assumption. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/assumption/basis.
Google Ngram Viewer shows how "assumption" and "basis" have occurred on timeline